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Determination of ammonia in air and aqueous samples with a gas-sensitive semiconductor capacitor
Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology.ORCID iD: 0000-0002-2817-3574
Linköping University, Department of Physics, Chemistry and Biology, Applied Physics. Linköping University, The Institute of Technology.
University of Lund, Sweden.
1984 (English)In: Analytica Chimica Acta, ISSN 0003-2670, E-ISSN 1873-4324, Vol. 164, 127-138 p.Article in journal (Refereed) Published
Abstract [en]

The properties of a new type of ammonia gas-sensitive semiconductor capacitor are described. The sensor is based on a palladium MOS field-effect capacitor with a thin layer (3 nm) of iridium surrounding the palladium gate. The lower limit of detection for ammonia in air is 1 ppm (0.59 mg kg−1). The analytical characteristics and temperature-dependence of the sensor in measurements of ammonia in air are evaluated. Ammonia in aqueous solutions is determined by the use of a continuous flow system utilizing a gaspermeable membrane in combination with the sensor. The calibration plot of the voltage drop of the capacitor vs. ammonia concentration in 150-μl samples is linear in the concentration range 0.2 × 10−6–5 × 10−5 M. Ammonia is determined in rain and river water as well as in whole blood and blood serum; 15 samples per hour can be assayed. Analytical recovery studies and the selectivity properties of the system are described and discussed. Finally, the properties of the flow-through system in continuous monitoring are described.

Place, publisher, year, edition, pages
Elsevier, 1984. Vol. 164, 127-138 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-88167DOI: 10.1016/S0003-2670(00)85624-XISI: A1984ABC2700012OAI: oai:DiVA.org:liu-88167DiVA: diva2:601825
Available from: 2013-01-30 Created: 2013-01-30 Last updated: 2017-12-06

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Winquist, FredrikSpetz, AnitaLundström, Ingemar

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